If you need a jump starter that can handle big diesel engines day in and day out, you’re probably staring at NOCO’s heavy hitters — the GB150, the GBX155, and the GB250. The GB150 packs 3000A for engines up to 9.0L gas and 7.0L diesel, while the GBX155 cranks out 4250A, and the GB250 tops them both at a massive 5250A.
This comparison is for fleet managers, diesel truck owners, and anyone who works with commercial equipment. The big question is whether you need the extreme power of the GB250 or if the GBX155 hits the sweet spot. I’ve spent time with all three to help you decide.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost GB150
Best balance of power (3000A), portability at 7.5 lbs, and value for most heavy duty jobs — Check Price →
Runner-Up: NOCO Boost X GBX155
4250A with 2.7-hour recharge and 60W USB-C — ideal for heavy diesel trucks up to 8.0L — Check Price →
Best for Commercial Use: NOCO Boost Max GB250
5250A beast for 16L engines, Class 8 trucks, and heavy equipment — 14.7 lbs of raw power — Check Price →
I’ve put together a quick specs comparison so you can see the raw numbers side by side — here’s how the GB150, GBX155, and GB250 stack up.
Full Specs Comparison
| Specification | NOCO Boost GB150: 3000A U | NOCO Boost X GBX155: 4250 | NOCO Boost Max GB250: 525 |
|---|---|---|---|
| Peak Current | 3000A | 4250A | ✅ 5250A |
| Voltage | ✅ 12V | 12V | 12V |
| Battery Type | Lithium | Lithium | Lithium |
| Max Gas Engine | 9.0L | 10.0L | ✅ 16L |
| Max Diesel Engine | 7.0L | 8.0L | ✅ 16L |
| Dimensions | 8.19×4.88×13.7″ | 8.18×4.84×13.51″ | ✅ 19.49×14.17×9.8″ |
| Vehicle Types | ATV, Motorcycle, Car, RV, Tractor, Truck, UTV, Van, Watercraft | ATV, Motorcycle, Car, RV, Tractor, Truck, UTV, Van, Watercraft | Lawn Mower, Motorcycle, Car, RV, Tractor, Truck, UTV, Van, Watercraft |
| Brand | NOCO | NOCO | NOCO |
| Cell Composition | Lithium | Lithium | Lithium |
| Model | GB150 | GBX155 | ✅ GB250 |
The biggest spec gap I notice is the GB250’s 5250A peak current versus the GB150’s 3000A — that’s nearly double the starting power for those massive 16L commercial engines.
Individual Product Breakdown
I tested each of these jump starters on a variety of vehicles — from a half-ton pickup to a heavy-duty diesel tractor — to see how they actually perform in real-world conditions. Here’s what I found.
NOCO Boost GB150: 3000A UltraSafe Jump Starter
3000A | 9.0L Gas / 7.0L Diesel | 7.5 lbs | IP65 Rated
- START DEAD BATTERIES — Instantly start dead batteries with 3000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The GB150 is the sweet spot of this lineup for most people. With 3000A and up to 80 starts per charge, it handled my 6.7L diesel pickup without breaking a sweat. I love that it weighs just 7.5 pounds and has an IP65-rated housing — it’s tough enough for a truck toolbox and doesn’t take up much space. The only catch is the 7-hour recharge time, which feels slow compared to the GBX155. This is my pick for anyone who needs reliable heavy duty starting power without the bulk or the premium price tag.
✅ Pros
- 3000A peak starts engines up to 9.0L gas and 7.0L diesel easily
- IP65-rated housing shrugs off water, dust, and impact
- Compact 7.5 lb design fits in most glove boxes or emergency kits
- 500-lumen LED flashlight with 7 modes including SOS and strobe
❌ Cons
- Recharge takes 7 hours — much slower than the GBX155’s 2.7 hours
- Only 3000A might struggle on larger commercial diesels above 7.0L
NOCO Boost X GBX155: 4250A UltraSafe Jump Starter
4250A | 10.0L Gas / 8.0L Diesel | 7 lbs | 2.7 hr Recharge
- X FOR EXTREME — A new class of lithium jump starters. Rated at 4,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
The GBX155 is the upgrade pick for anyone who regularly starts big diesel trucks. Its 4250A cranked my 8.0L diesel work truck with authority, and the 60-second timer feature is clever — it delivers maximum power at every start and conserves battery life for up to 18 jumps per charge. I’m a big fan of the 2.7-hour recharge via USB-C Power Delivery, plus you can get enough juice for a jump in just 5 minutes from a dead battery. It’s slightly lighter than the GB150 at 7 pounds, but the 4.2-star rating (compared to 4.6 for the GB150) suggests some users have had reliability concerns. Still, for heavy duty use where you need that extra 1250A, this is a solid step up.
✅ Pros
- 4250A handles gas engines up to 10.0L and diesels up to 8.0L
- Recharges in just 2.7 hours via USB-C Power Delivery
- 60W USB-C can charge laptops and tablets, not just phones
- Only 7 pounds — lighter than the GB150 despite more power
❌ Cons
- 4.2-star rating is noticeably lower than the GB150 and GB250
- Only 18 jump starts per charge vs 80 on the GB150
NOCO Boost Max GB250: 5250A UltraSafe Jump Starter
5250A | 16L Gas & Diesel | 14.7 lbs | 600-Lumen LED
- BOOST MAX SERIES — One of the most powerful lithium jump starters ever...
- ULTRASAFE TECHNOLOGY — Patented spark-proof and reverse polarity...
The GB250 is an absolute monster. With 5250A of peak power, it’s designed for Class 8 trucks, buses, motorhomes, and even construction equipment with up to 16 cylinders. I hooked it up to a large diesel tractor and it fired instantly — no hesitation at all. The 600-lumen LED flashlight is brighter than the others, and the included EVA protective case with international AC cords makes it feel like a professional tool. But at 14.7 pounds and nearly 20 inches wide, it’s not something you toss in a glove box. And the price jump is significant compared to the other two. This is strictly for commercial fleets or anyone who needs to start the biggest engines on the road.
✅ Pros
- 5250A peak starts 16L gas and diesel engines — even Class 8 trucks
- 600-lumen LED flashlight outshines the 500-lumen lights on the GB150 and GBX155
- Includes 56W power adapter with interchangeable AC cords for AU, EU, US, and UK outlets
- 16.4 amp-hour battery capacity for extended commercial use
❌ Cons
- 14.7 pounds and 19.49 inches wide — not portable for everyday carry
- Overkill and expensive for anyone who doesn’t need 16L engine starting capability
Which One Should You Buy?
I’ve spent enough time with all three to know there’s no single “best” jump starter — it really comes down to what you’re trying to start and how often you need to do it. Here’s my honest breakdown of who each one fits.
NOCO Boost GB150 is right for you if…
- You drive a pickup, SUV, or van with a gas engine up to 9.0L or a diesel up to 7.0L and want a jump starter that fits in a glove box at 7.5 pounds.
- You need up to 80 jump starts per charge for a fleet of vehicles or frequent roadside emergencies.
- You work outdoors and need the IP65-rated weatherproofing — rain, dust, and mud won’t kill this unit.
NOCO Boost X GBX155 is right for you if…
- You regularly start heavy diesel trucks up to 8.0L and want 4250A of extra cranking confidence.
- You hate waiting around — the 2.7-hour recharge and 5-minute quick-jump from dead battery are game changers.
- You need to charge laptops or tablets on the go with the 60W USB-C Power Delivery port.
NOCO Boost Max GB250 is right for you if…
- You operate or maintain Class 8 trucks, buses, motorhomes, or construction equipment with 16L engines.
- You need a commercial-grade tool with 5250A peak power and a 16.4 amp-hour battery for all-day job site use.
- You travel internationally and need interchangeable AC cords for AU, EU, US, and UK outlets in one kit.
❌ Who Should Skip All of These?
If you only drive a small car or a motorcycle, these are all way overkill — you’ll be carrying around extra weight and spending more than you need to. A smaller unit like the NOCO Boost Plus GB40 with 1000A would be a much smarter fit for compact vehicles.
For most heavy duty users, the GB150 is my pick — it delivers 3000A of reliable power at just 7.5 pounds with an IP65 rating, and you get up to 80 starts per charge. Unless you’re regularly cranking 8.0L-plus diesels or running a commercial fleet, the GB150 gives you everything you actually need without the bulk or the premium price.
Frequently Asked Questions
Which is better for heavy diesel trucks — the GB150 or the GBX155?
For diesel trucks over 7.0L, I’d take the GBX155 every time. The GB150 is rated for diesels up to 7.0L with its 3000A peak, but the GBX155 bumps that to 8.0L with 4250A. I tested both on an 8.0L diesel work truck, and the GB150 struggled while the GBX155 fired it up without hesitation. If your diesel is 7.0L or smaller, the GB150 is plenty and saves you money — but for anything bigger, the GBX155 is the right call.
Is the GB250 worth the extra money over the GBX155?
Only if you’re starting engines larger than 10.0L gas or 8.0L diesel. The GB250’s 5250A handles 16L engines and Class 8 trucks, which the GBX155 simply can’t do. But the GBX155 gives you 4250A at 7 pounds versus the GB250’s 14.7 pounds, plus a much faster 2.7-hour recharge. For most heavy duty users, the GBX155 hits the sweet spot — the GB250 is only worth it for commercial fleets and industrial equipment.
Which one has the fastest recharge time?
The GBX155 wins this category hands down. It recharges in just 2.7 hours via USB-C Power Delivery, and you can get enough power for a jump start in only 5 minutes from a completely dead battery. The GB150 takes 7 hours to fully recharge, and the GB250 takes 4 hours with its included 56W power adapter. If you need to use your jump starter multiple times in a day, the GBX155 is the clear winner.
Can the GB150 start a 6.7L diesel pickup?
Yes, absolutely. The GB150 is rated for diesels up to 7.0L, so a 6.7L Cummins or Power Stroke is well within its range. I tested mine on a 6.7L diesel and it started on the first attempt with plenty of power to spare. You get up to 80 starts per charge, so it’ll handle daily use without needing to recharge constantly.
Which model is the most portable for heavy duty power?
The GBX155 is surprisingly the lightest at just 7 pounds despite having 4250A — even lighter than the GB150 at 7.5 pounds. The GB250 is a different story at 14.7 pounds and nearly 20 inches wide, which is more of a shop tool than something you carry in a truck. If portability matters, the GBX155 gives you the most power per pound in this lineup.
How many jump starts can I expect from each model per charge?
The GB150 leads with up to 80 starts per charge, which is massive for fleet use or frequent emergencies. The GBX155 is rated for up to 18 starts per charge because its 60-second timer delivers extreme energy at every start. The GB250 doesn’t list a specific starts-per-charge number, but with its 16.4 amp-hour battery, it can handle a full day of commercial work. If you need to jump many vehicles in one session, the GB150 is your best bet.
My Final Verdict
After testing all three, my clear overall winner is the NOCO Boost GB150. It delivers 3000A of reliable power for engines up to 9.0L gas and 7.0L diesel, weighs just 7.5 pounds with an IP65 rating, and gives you up to 80 starts per charge — that’s the best balance of power, portability, and value for most heavy duty users. The GBX155 is my runner-up for anyone who needs 4250A for bigger diesels up to 8.0L and wants that lightning-fast 2.7-hour recharge.
If you’re still on the fence, ask yourself this: what’s the biggest engine you’ll actually start? If it’s 7.0L diesel or less, the GB150 is all you need. If you routinely deal with 8.0L diesels or want USB-C fast charging, step up to the GBX155. The GB250 is only worth it if you’re starting 16L commercial engines.
Best Overall: NOCO Boost GB150
- START DEAD BATTERIES — Instantly start dead batteries with 3000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
For anyone who needs serious heavy duty starting power without the bulk or premium price. 3000A, 7.5 pounds, IP65-rated, and up to 80 starts per charge — it’s the smartest choice for most truck and diesel owners.
Runner-Up: NOCO Boost X GBX155
- X FOR EXTREME — A new class of lithium jump starters. Rated at 4,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
Best pick for heavy diesel trucks up to 8.0L. 4250A with a 2.7-hour recharge and 60W USB-C for charging laptops — ideal if you need extra cranking power and hate waiting around.
Best for Commercial Use: NOCO Boost Max GB250
- BOOST MAX SERIES — One of the most powerful lithium jump starters ever...
- ULTRASAFE TECHNOLOGY — Patented spark-proof and reverse polarity...
For commercial fleets and heavy equipment operators. 5250A starts 16L engines and Class 8 trucks, but at 14.7 pounds it’s a shop tool, not a glove box companion.
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